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MSB Safeties

  • MSB to be installed on a raised platform.
  • The location where MSB is installed should have good ventilation, illumination and affected by minimum vibration.
  • The operating floor space in front and behind the MSB should be covered with antiskid, insulated rubber mats with a minimum thickness of 15 mm.
  • There should be adequate space around allowing comfortable operation and maintenance.
  • Door opening mechanism should be interlocked with power supply.
  • Panel doors should be in locked position.
  • The enclosure should be drip proof.
  • MSB should be dead front type. (i.e. All the live conductor should pass behind MSB)
  • No water or oil pipes should pass above the MSB.
  • Every equipment onboard must be properly earthed. Also, MSB must be properly earthed.
  • Every incoming and outgoing feed must be protected by a switch fuse or circuit breaker.
  • Insulation resistance should not be less than 1 Mega Ohm in any case. Insulation Resistance (IR) to be checked and records are maintained.
  • All meters must be calibrated periodically and records are maintained.
  • All the meters, switches, fuses, push button, indicating lamps, etc. should be in working condition and identified with individual nameplate or tag.
  • All the interlocks must be in working condition.
  • Operating switchgear, tools such as circuit breaker handle, fuse puller, lamp grip, etc. must be readily available and to be used.
  • Appropriate ready to use fire extinguishers should be positioned nearby. (CO2and DCP)
  • Red tag/nameplate indicating high voltage and danger sign should be fitted
  • Wiring diagram laminated or framed indicating supply system must be displayed nearby.
  • Earth fault indication should be fitted and displayed in front panel.
  • Charts indicating drill procedures in case of electric shocks must be displayed near MSB.
  • All the appropriate spares should be properly preserved and protected, individually packed and identified, and should be readily available for use.


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